Define 1 W of power.

Explanation

Power of an agent is said to be 1 W if it does 1 joule of work in 1 s, i.e.,
`1 watt (W) = (1 joule(J))/(1 second (s)) =1 J//s`
In other words, we say that power is 1 W when the rate of consumption of energy is 1 J//s.